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The RT8547 is a high efficiency, high current, Boost-type flash LED driver capable of 1.6A maximum output current. It is an ideal power solution for LED photo flash applications in all single cell Lithium-ion/polymer battery operated products. <p align="justify">The RT8547 maintains output current regulation by switching the internal high side and low power switches switch transistors. The power switches are pulse width modulated at a fixed frequency of 2MHz. The high switching frequency allows the use of small inductor and output capacitor that makes the RT8547 being ideally suited for small battery powered applications. </p><p align="justify">One-wire dimming control function is designed to set the strobe mode current level through the FLSET pin for the flash LEDs. </p><p align="justify">The RT8547 contains over voltage protection, over current protection and over temperature protection functions to protect the device from output open circuit and short-circuit conditions. An internal soft- start control circuit is built-in to prevent excessive inrush current during start-up. In shutdown mode, the supply current is reduced to 2&mu;A.</p>
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  • 2.8V~5.5V 输入电压范围
  • 电流精度在5%之内
  • 高达1.6A调节输出电流
  • 使用小型电感，效率可高达 88%
  • 2MHz开关频率
  • 分离的闪控和手电筒模式电流
  • 可程序设计的安全定时器
  • 输入电流限制
  • LED开路的过压保护
  • 过温保护
  • 确实断开负载连接
  • 关机电流 : <2μA
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移动电话 数字相机 PDA及智能型手机 便携式仪器 高性能 DSP、FPGA和 ASIC供电
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